//引入events模块
var events=require('events');
//创建eventEmitter对象
var eventEmitter=new events.EventEmitter();
//创建事件处理程序
var connectHandler=function connected(){
console.log('连接成功!');
//触发data_received事件
eventEmitter.emit('data_received');
}

//绑定connection事件处理程序
eventEmitter.on('connection',connectHandler);

//使用匿名函数绑定data_received事件
eventEmitter.on('data_received',function(){
	console.log('数据连接成功!');
});

//触发connection事件
eventEmitter.emit('connection');

console.log('程序执行完毕。');
